bKAGRA Suspensions Actuator Design Summary

suspension and stage	coil	magnet	coil-magnet	coil driver
MCi/e/o (Type-C) TM	41 turns by default (some are 40 turns?), ~2.5 Ohms(klog#2124)	NdFeB 1mm dia, 5mm thick	0.0014 N/A at max	TAMA
IM	-	-	-	-
IMMT1/2 (Type-C) TM	39 turns ?	NdFeB 2mm dia, 5mm thick		high power
IM	-	-	-	-
PR2/3/M (Type-Bp) TM	600 turns	SmCo 6mm dia, 3mm thick	0.129 N/A at max	high power
IM	600 turns	SmCo 10mm dia, 10mm thick	1.26 N/A at max	high power
BS (Type-B) TM	600 turns, ~11 Ohms	SmCo 2mm dia, 3mm thick	0.0138N/A at max	low power
IM	600 turns, ~13 Ohms	SmCo 10mm dia, 10mm thick	1.25 N/A at max	low power
SR2/3/M (Type-B) TM	600 turns	SmCo 2mm dia, 5mm thick	0.0225 N/A at max	low power
IM	600 turns	SmCo 10mm dia, 10mm thick	1.26 N/A at max	low power
ITM/ETM (Cryopayload) TM	100 turns, 17 Ohms (measured at room temp; estimated to be 0.6 Ohms for cryogenic)	SmCo(?) 2mm dia, 2mm thick ?	0.0015 N/A at max (measured at room temp with 88turns)	low power
IM	600 turns, 57 Ohms (measured at room temp; estimated to be 2 Ohms for cryogenic)	SmCo(?) 2mm dia, 2mm thick ?	0.015 N/A at max (measured at room temp with 585turns)	low power(with R65 and R97 700Ohm)
Marionette	600 turns, 57 Ohms (measured at room temp; estimated to be 2 Ohms for cryogenic)	SmCo(?) 5mm dia, 13mm thick ?	0.45 N/A at max (measured at room temp with 585turns)	low power(with R65 and R97 700Ohm)

Coil Drivers

TAMA coil driver has 50 Ohm, 20 mA/V. EL2099, 440 mA at max. Summary by Koji Arai is here.
Low Power Coil Driver (JGW-D1503507) has 7.8 kOhm at DC (1.258 kOhm at high frequency; pole at 50Hz, zero at 312 Hz), 0.128*1.33 mA/V at DC (voltage gain of 1.33 is applied in the driver). AD8671, 20 mA at max (+/- 15V supplied).
Modified Low Power Coil Driver (for Type-A IM and Marionette) has 1.4 kOhm at DC (724 Ohm at high frequency; pole at 161Hz, zero at 312 Hz), 0.714*1.33 mA/V at DC (voltage gain of 1.33 is applied in the driver). AD8671, 20 mA at max (+/- 15V supplied).
High Power Coil Driver (JGW-D1503503) has 80 Ohm, 12.5 mA/V at DC. OPA548, 3 A at max.

Heat generated by coils for Type-A cryopayload is 2.2 mW at maximum
- 0.6 Ohm * (0.128*1.33 mA/V * 10 V)² * 4 coils + 2 Ohm * (0.714*1.33 mA/V * 10 V)² * 6 coils + 2 Ohm * (0.714*1.33 mA/V * 10 V)² * 6 coils = 2.2 mW